Help with a last few gaps!

I, like many others on this site, am aiming to obtain a single coin from as many different countries as possible. I have 3 album for common coins and 2 for the more rarer. I have nearly filled the first three albums but still have a few gaps and really want to get these filled before I move on to the rarer ones. So, are any of you able to find me anything from the following countries? I will trade several common coins for any that are rarer.

Comoros, Djibouti, Guinea, Kiribati, Lesotho, Liberia, Mauritania, Mongolia, Oman, Pitcairn Island, Qatar, Saharawi, Turkmenistan, Vietnam (post 1980), Yemen

Anything is considered!
thanks guys

I can help you with Vietnam if you want to swap again.

matt